protected string GetData(IObdConnection connection)
{
// Write PID request
connection.Write($"{Pid} {RequestsNum}\r");
// Read PID response
var response = string.Empty; // string to be returned
while (!response.Contains(">"))
{
//loop until a ">" is recd. End of line char with the ELM327
//or 200 msec timeout and no read, exit the loop and timer function too
try
{
var buffer = new byte[20]; // the pid data buffer
var count = connection.Read(buffer, 0, buffer.Length);
response += Encoding.ASCII.GetString(buffer, 0, count);
}
catch (TimeoutException ex)
{
_logger.LogError($"Failed to read data: {ex.Message}");
response = string.Empty;
break;
}
}
//Validate PID response
//Get the data and put in array and convert to a string and return string
//Replace the pid request with 41 to match the OBD response
var responsePos = response.IndexOf(Pid.Replace("01", "41"), StringComparison.Ordinal);
if (responsePos > -1 && !response.Contains("DATA") && response.Length >= 7)
{
response = response.Substring(responsePos, 5 + 3 * BytesNum);
}
return(response);
}